Stapling machine



NOV. 26, 1940. T. KlLBRlDE l 2,223,322

STAPLING MACHINE Filed oct. 1, 19:57 2 sheets-sheet 1 2, INVENTOR' 2f f Jaim fiamma/e,

ATTOR Y Nov. 26, 41940.

J. T. KILBRIDE STAPLING MACHINE Filed Oct. l, 1937 2 Sheets-Sheet 2 INVENTOR Jaim 27 'r BY l l ATToRN v vPatented Nov. 26, 1940 UNITED STATES PATENT NoFFicia:

E. W. Carpenter Manufacturing Company,Y

` Bridgeport, Conn., a corporation of Connecticut Application October 1,v

` 11 Claims.

The invention relates tostapling machines and more particularly to the type which is manually operable to insert and clinch staples.

It is an object of the present invention to provide a stapling device whichis rugged, dependable and simple in operation and one which can be made at a very low cost.`

According to the present invention,` the device is formed of sheet metal parts, most of which are stamped from sheet stock and which are assembled in compact relation. The head 'for carrying the staple-driving plunger is made' up of a -plurality of substantially flat strips `placed in face-to-face relation, so that a thin plungercarrying head results. The arm for carrying the plunger-carrying head is made up of a pair of nested C-shaped channel members welded together along one side thereof so as to formbetween the two a channel for the reception of the staples and the staple feed mechanism. The use `of the usual pivot andbiasing spring for supporting and holding the plunger-carryingl arm in raised position hasv been avoided land the arm is secured directly to the base on a resilient portion thereof in such'a manner as to be normally held in raised position but movable into wcrk-engagingposition. By Vsecuring the plung-v er-carrying arm directly to the base, a more rigid unit is attained and the side play attendant to the wear of the pivot is avoided. f Y

The elements of the machine, being iof'sheet metal, can be readily formed and assembled with a minimum of operations and a minimum amount of time, thus reducing considerably the kcost of manufacture of the device.

Other features and advantages ofthe inventionwill be apparent from the specification taken in connection with the drawings, in which:

Figure 1 is a side elevationy ofthe device.,Y Fig. 2 is a front elevation of the device.

Fig. 3 is a longitudinal section of the device.

Fig. l is a sectional View `taken along line 4--4 of Fig. 3. M

Fig. 5 is a sectional view taken along lines 5&5 of Fig. 3.

Fig. 6 is a sectional view taken along line 6 6. of Fig. 3.

Fig. '7 is a sectional view of the device showing the plunger-carrying arm being moved into the staple-driving plunger moving the staple into engagement with the work.

Fig. 9 is an exploded View of the ydevice show- 1937, Serial No. 166,769

( Cl. 1 3) p i ing the elements tied together by dot-and-dash` lines;

Fig. 10 is a view showing the type of staples usedin the machine.

According to the present invention, a base is stamped from sheet metal and formed to present a i'lat raised surface. This surface has formed therein, adjacent the forward end, an f anvil` 2I--for clinching' the staples to be driven. At the back end ofthe base a portion 22 is lanced out and fbentso as to extendV above the base to receive the plunger-carrying arm and resiliently hold the same in raised position. out of engagement with the workbut because of its resiliency will enable theplunger-carrying arm to be moved into work-engaging position as will be later de- `scribed.

The plunger-carrying'arm of thepresent inventionis-forrned`by nesting together two C- shaped channels 23 and 24 of different dimen'V sions `as shown'in the drawings, 'and securing them along the side opposite the opening of the C. This may be done by spot welding or other means.' The channels are so shaped that when v nestertogether they form a staple-receiving passagevfor reception andl storage of the staples to be fed successively to the staple-drivingplunger. Thestaples may be in the form of a strip of staples v21, as shownin Fig.. 10, in 'which the staples `are readily separated from the' strip by the action of` theplunger. The rearward end of the innerrchannel 24 extends a short distance beyond Ithe end of the .channell 23 so as to form a guide whereby the `staples can be readily insertedinto the staple-receiving space. The composite arm is secured `at one end to the tang 22 by a pair of rivets 26. The other end of the C- shaped channel 23 is provided with a pair of integrally formed outturned ears 25, which arel results when an attempt to produce satisfactory pivots for the arm at a low cost is made.

The plunger-carrying head of the present invention is formed of flat stock stamped to the desired shape and is readily assembled in faceto-face `relation to form a plunger-carrying head which is thin and flat and which may be readily secured together by welding or other means. The plunger-carrying head comprises a flat face plate 28, a pair of spaced plates 29 and a back plate 30. The plates are so proportioned that when assembled, the spacer plates, the face plate and back plate form a channel for receiving a thin flat staple-driving plunger 3|, the width of the head being equal to the width of the two spacer plates plus the width of the plunger.

The staple-driving plunger is provided with an operating handle 32 formed from a'flat strip of sheet metal bent into a closed loop with the end's secured together and riveted to the back surface of the staple-driving plunger by a pair of rivets 33.

The face plate 28 is provided at its upper. edge with a recess 34 stamped therein for receivingV the turned-over heads of thev rivets whenl the plunger is moved into staple-driving position. The back plate has a portion cutout'. from its upper edge to form an opening 35 adapted toreceive the part of the handle secured to the plunger out away to form an opening 36. The opening; is

positioned at the end of the plunger-carrying arm as shown in Fig. 3 and is of such Vsize that the face plate extends over the space formed in thearm to receive the staples so that the face plate forms a stop against which the staples are pressed by the staple-feeding' means, to be described, when the plunger is in raised position. The opening permits the user of the device to readily view the work so that the staple maybe accurately located andV also permits the extraction of staples which may be jammedfor any reason whatsoever.

The face plate 28 has intermediate its ends a tang 31 struck therefrom and extending to the rear thereof and adapted to pass through a slot 38 formed in the plunger andv into an aperture 39 in the back plate which supports the free .end of portion whereby the head may be anchored to l the arm. This projecting portion is formed byl .slitting the sides of the backing plate inwardly' from the sides so that the uncut po-rtionv is equal the tang. This tang, operating in the slot, provides a stop f or limiting the movement ofthe plunger inthe head.

The back plate 30T is formed with al projecting vto the width of the plunger-carrying arm. This section is bentoutwardly andthe parts formed by the lslits are bent downwardly so as to form a rearwardly-extending saddle-like member composed of an upper or top of the saddle 4|) and a pair of sides 4| which are adapted to-t over the channel 23 and be secured thereto by weldingv inthe spots indicated by the stippling, in Fig; 9.

As will be seen fromthe drawings; the ears 25'y willv extend into engagement with the spacer plates to be secured thereto and the sides 4| will not only engage and be secured to the vsides of the channel but will abut the back of the ears 25 so that a rigid and durable connection between the plunger-carrying head and thev arm is obtained.

The top of the saddle 40 is provided with a hole 42 in whichY is secured a post 43 extending parallel to the staple-driving plunger. The handle 32 has extending therefrom to the rear of the driving plungerV one end of the handle material which forms an abutment 44. The abutment 44 is provided ywith an aperture 45 and the handle is provided with another aperture 46 which is aligned with the aperture 45 and both of which slidably receive the post. A spring 41 isy positioned be.-

5 tween the top of the saddle and the abutment The face plate has at its lower end a portion and normally tends to hold the staple-driving plunger in raised position.

'Ihe spring is of sulicientstrength that it will hold the plunger inl `raised position during the initial pressure on the handle as shown by the arrows A in Fig. 7 which will move the arm into work-engaging position against the resiliency of the lanced-out'portion 22. Additional pressure, as indicated bythe arrows B in Fig. 8, will compress the spring 41 and cause the plunger to drive the staples against the anvil so that they will be clinched in the work.

The mechanism for successively feeding the staples into driving position is of the well-known type comprising a guide rod 5|) having a hooked portion 5|.at on'eend thereof adapted to be inserted into an aperture 52 formed in the two channels and .the base as shown in Fig. 3. A staple contactor 53 is shaped so as to slide in the storage space between the two nested C-shaped membersfandV engage the back of the strip of staples. The: `contactor is adapted to be slidably mounted on the guide.V According to the present invention, 'a U-shaped member 54 is inserted through a pair of holes in the top of the contactor and secured theretoV with the legs` extending upwardly therefrom. 'Ihe legs have aper-L tures for slidably receiving the guide 5D, and the contactor is'held from sliding off the guide by the end of the. guide being` headed over as shown at 55. The staple contactor is biased to slide along the rod; 50 and move the staples against the face platev by a spring 56 surrounding the guide rod andv abuttingagainst the hooked end at one end and one of the legs on the contactor at the other end'.

The exploded view in Fig. 9 clearly shows the simplicity of the device. It shows the elements ready to be assembled with the dot-and-dash lines tying the elements together. This view shows the head positioned to be assembled with the welding points being stippled. From this view it will' be seen that the partsvcan be readily formed by stamping and be .easily assembled into completed form with the minimum of operations soy that a durable, reliable and inexpensive stapling device will be obtained.

Variations and modications may be made tion; a plunger-carrying arm secured to the flexible portion ofthe base so as to be normally held out of but movable into 'work-engaging position; and astaple-driving plunger carried by the arm.

2. In a machine for inserting and clinching metallic staples, the` combination of a sheet metal base having an integral ilexible tang extending angularly therefrom, the free end of said tang normally projecting above the upper surface of the base; a plunger-carrying arm secured to said tang so as to be normally held out of but movable into work-engaging position; vand a staple-driving plunger carried by the arm.

3. In a machine for inserting and clinching metallic staples, the combination of a sheet metal base having an integral resilient tongue projecting angularly therefrom; a plunger-carrying arm secured to the tongue and normally carried by said tongue out of work-engaging position, the resiliency of the tongue permitting the arm to be moved into Work-engaging position; and a staple-driving plunger carried by the arm.

4. In a machine for inserting and clinching metallic sltaples, the combination of a base; an oscillatable arm mounted on the base; a thin at plunger-carrying head adapted to be mounted on the ends of the arm' comprising a face plate, a back plate and thin spacer plates,

the back plate being provided with a rearwardly-` extending saddle adapted to iit over and be secured to an end of the oscillatable arm to secure the head to the arm; and a staple-driving plunger carried by the head.

5. In a machine for inserting and clinching metallic staples, the combination of a base; an oscillatable arm mounted on the base; a thin flat plunger-carrying head adapted to be mounted on the end of the arm comprising a face plate, a back plate and thin spaced plates; a stapledriving plunger in the head; the back plate being provided with a rearwardly-extending saddle adapted to fit over an end of the oscillatable arm to secure the head to the arm, the upper surface of the saddle being provided with an aperture; a post secured in the aperture and extending parallel to the plunger-carrying head; and a spring surrounding the post and normally urging the staple-driving plunger into raised position. f

6. In a machine for inserting and clinching metallic staples, the combination of a base; an oscillatable arm mounted on the base; a plungercarrying head adapted tobe mounted on the end of the arm; a plunger mounted in the plunger-carrying head and having a handle comprising a loop of strip sheet metal with the ends of the loop forming a projection whereby it is secured to the plunger with one of the ends being projected to form an abutment; a post secured to the head and positioned so as to extend parallel to the plunger; and a spring surrounding the post and abutting the abutment formed on the handle to normally hold the plunger in raised position,

7. In a machine for inserting and clinching metallic staples, the combination of a base; an oscillatable arm mounted on the base; a plungercarrying head adapted to be mounted on the end of the arm; a plunger mounted in the plungercarrying head and having a handle comprising a loop of strip sheet metal with the projecting ends of the loop forming a projection means whereby it is secured to the plunger with one rof the endsr being projected to form an abutment;

a post secured to the head and positioned so as to extend parallel to the plunger; and a spring surrounding the post and abutting the abutment formed on the handle to normally hold the plunger in raised position, said handle and abutment being provided with aligned apertures to receive the post when the plunger is depressed and the spring compressed.

8. In a machine for inserting and clinching metallic staples, the combination of a base; an oscill'atable arm mounted on the base; a thin at plunger-carrying head on the end ofthe arm comprising a face plate, a back plate and thin spacing members positioned between the face plate and back plate and forming a guide channel therein; and a thin at plunger moving in the channel formed in the head by said plates,

the plunger having a longitudinal aperture, and

to the arm, one of the channels being formedv with out-turned ears adapted to be engaged by the head whereby the same may be secured to the arm.

l0. In a machine for inserting and clinching metallic staples, the combination of a sheet metalV base having a resilient tongue extending therefrom; a plunger-carrying arm comprising a pair or" C-shaped sheet metal channels nested to form a staple-receiving and supporting passage secured to the resilient tongue; a plunger-carrying head mounted on the arm comprising a sheet metal face plate, a sheet metal back plate and a pair of sheet metal spacer plates interposed between the face plate and back plate and forming a channel in the head; a sheet metal stapledriving plunger movable in the channel in the plunger-carrying head; a handle secured to the plunger comprising a loop of strip sheet metal; means normally tending to move the plunger into raised position in the head; and initial pressure on the handle moving the arm against the resiliency of the tongue so that it moves into Work-engaging position and further pressure on the handle overcoming the tendency of the lastnamed means so that the staple-driving plunger moves into staple-driving position.

11. In a machine for inserting Vand clinching metallic staples, the combination of a sheet metal base having a resilient tongue projecting therebetween; a plunger-carrying arm secured to the tongue and normally held out of work-engaging position, the resiliency of the tongue permitting the arm to be moved into work-engaging position; a staple-driving plunger carried by the arm, the plunger-carrying head comprising a sheet metal face plate, a sheet metal back plate, and a pair `of sheet metal spacer plates interposed between the face plate and the back plate and forming a channel in the head; a sheet metal staple-driving plunger mounted in the channel in the plunger-carrying head; a handle for the plunger comprising a loop of strip sheet metal secured to the upper end of the plunger; and means normally tending to move the plunger into raised position in the head.

' JOHN T. KILBRIDE.

CERTIFICATE 0F CoRREcToN.

Patent No. 2,225,522' November 26., 19140..

JOHN Ta KILBRIDE It is hereby certified, that error appears in the printed specification of the above numbered patent requiring correction as follows: Page l, second column, line 25, for "nester" read -/-nestedu page 5, first Column, line A52, claim 7, strike out the word "projeotion"; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Office Signed and sealed this lllth day of January, A.v D. 19141.

Henry Van Arsdale, (Seal) Acting Commissioner of Patents. 

